Process for making sulfur-containing phthalocyanines



Patented Feb. 25,1947

PROCESS Fort MAKING sIiLFUR-coN- TAININGIPHTHALOCYANINES Norman Hulton Haddock and Cliif ord Wood,

- "This invention relates to the manufacture of new sulphur-containing dyestuifs and'more particularly 'to' the manufacture of new sulphur-containing dyestuffs derived from thioamides. "We have found that by heating phthalocyanine sulphonyl chlorides with thioamides, substances areobtained' which will dissolve in aqueous so -dium sulphide solutions, yielding liquors which on application to cotton and subsequent oxidation yield'blue and green dyeings thereon. That is to say, the products obtained by heating phthalocyanine sulphonyl chlorides with thioamides can be used for dyeing cotton by the customary tech nique employed in connection with sulphur dyestufls. Besides thioamides, substituted thioamides as'defined below may also be used.

Accordingly the present invention relates to a process-forthe manufacture of sulphur-contain- .ing zdyestufis comprising heating a metal or metal-free phthalocyanine sulphonyl chloride with a. thioamide, one hydrogen atom of the vamido group of which may, if desired, be replaced by an alkyl or aryl group. It will be recognized that such thioamides possess the radical As examples of phthalocyanine sulphonyl chlo rides which may be used inaccordance. with-the ,present invention are mentioned:xcopperphthalo- .cyanine tetra-(4)-sulphonyl chloride, copper phthalocyanine tri-(4)-sulphony1 chloride .and metal-free phthalocyanine trisulphonyl chloride.

As thioamides there may be employed in this invention, for instance, thiobenzamide, phenyldithiobiuret, thiourea and allylthiourea. Additional instances .of applicable thioamides are named in the specific examples which iollow, and it will be observed that all these have the common quality of being molten at the temperature of the reaction in the presence of the other ingredients of the reaction. 1 The present dyestufis yield dyeings on cotton of blue to green shades, which possess good fastness properties, particularly good fastness to wet treatment.

The following examples, in which the parts are by weight, illustrate, but do not limit, the invention.

Blackley, Manchester, England, assignorslto Imperial Chemicallndustries Limited, a cor: pora'tion of Great Britain No Drawing. Application June 21,1 1944, semi No. 541,456. In Great Britain July 7, 1943 I 7 Claims. (01. zen-314.5)

Example 1 10 parts of copper phthalocyanine tetra-(4)? sulphonyl ch1oride,'obtainable by heating tetra:- potassium copper phthalocyanine tetra-(4)-sulphonate with phosphorus pentachloride in nitrobenzene, are heated with 40 parts of thiourea at 170-17 5 C. for 2 hours. I The melt, which is bright green in colour, is cooled and extracted with 500 parts of'boiling water. The residual greensolid is then filtered off'and washed with water. On drying it forms a bright green powder. which dissolves in hot dilute'aqueous sodiumsulphide solution yielding a bluish grey solution. The latter dyes cotton in grey to black shades, which on being allowed to'oxiclise in the air become bright green and are of good fastness proper?- ties; particularlyin respect of wet treatment. 1"

I .1 Example? 2 1 The 40 parts of thiourea used in Example l are replaced by 60 parts of thiobenzanilide. A dyestufi 'of similar properties to those of Exam'ple 'lis obtained.

" Example 3 parts of metal-free phthalocyanine trisul- 'phonyl chloride (obtainable by heating with phosphorus pentachloride in nitrobenzene' trisodium metal-free phthalocyanine trisulphonate, itself got by "sulphonating metaI-i'ree' phthalocyanine),

are heatedwithbo parts of thiourea at 170-1'75 C. "for 2 =hours. same wayas in Example 1. The product isa bright yellowish green powder which dissolves a bluish grey solution. This latter dyes cotton in bluishvgrey shades which change to bright yellowish'green shades on oxidation in air. The shades so obtained are of good fastnessproper' 4 ties. 0

Example 4 f In place of the parts of thiourea employed inExample 3, there are used parts of phenyl- -"45 dithiobiuret. A new :dyestuft similar ,tothat of Example 3 is obtained.

"Eftample I 10' parts of marl-me nthaiocyamn'e may 50 phonyl chloride (obtainable as described in Example 3) are heated with 50 parts of N-methylthiourea at -125" C. for hour. The melt.

is then treated in the same way as in Example 1. A new dyestufi of similar shade to that of Ex- 56 ample 3 is obtained.

The melt is then treated in the v in hot dilute sodium sulphide solution affording Y of N:N'-dimethy1thiourea.;

similar shade to; that of .Example'sfis olita'ined.

Example 6 In place of the 50 parts of N-methylthiourea employed in Example 5, there'are used 50 parts A new dyestufl of Example 7 In place of the 50 parts of N-methylthiourea' employed in Example 5, there arev used .50,par,ts of N-methyl-N'-dimethylthiourea. 'gAmew e.-

Ewample 8 1 parts of metal-free phtha locyanine trisu'l phony] chloride (obtainable as described in Example 3) are heated with fifl' parts of thioace'tanili de atf110-115 C. for hour." "The me1t,

which is bright green in colour, is cooledand .ex-

tracted with 200 parts f boiling alcohol. The I green solid in suspensionis filtered off and washed three times with 50 parts 'of alcohol, and dried. A mew :dyestuff, whichadyes cotton similarly to thatofExample ;3,.is obtained. 7 Y 1 Example {9 10 parts of metal free :phthalocyanine trisulpl'ionylpchloride (obtainable as described :in ,Example 3) are heated ,with.50 parts of :thioacetamide at 130-l35 C. rfOI 'hour. The melt i s then .treated in the :same at as in..Ex ample 8. .A -.new -.dye.stufi, which' dyes cottonlsimilarly to thatotExample 3,,is obtained. 5 1

* Example 1-0 l;0 parts of the copperphthalocyanine polysulphonyl'chloride, {made as, described .below, are heated .With .50Lpartsofthioura ,at 170-175 C. for 1 hour. The men is cooled and extracted with 400 parts of boiling water. The green susand metal-free phthalocyanine sulphonyl chlo-,- rides with a thioamide having at leastone free a hydrogen atom attached to the nitrogen atom of the thioamide radical.

v 2. .Process .for the manufacture ,ofasulphur- "containing dyestufi comprising heating metalfree phthalocyanine trisulphonyl chloride with I thiourea.

series, which comprises heating a phthalocyanine at least one free hydrogen atom on the'amide compound selected .from the group consisting of gmetal- :and-metalefree phthalocyanines containing-sulphonyl chloride groups, with an. organic compound containing a thioamide group having nitrogen,- un'til the phthalocyanine compound has pension is filtered off and the residue washed three times with '100 parts of water. The product dissolves inaqueoussodium sulphide solution to a bluish grey solution, which dyescottonin grey shades oxidising .in theair to "bright bluish green.

.The copper phthalocyanine 'polysulphonyl chloride tused above-is made as follows: IO-parts .ofecopper phthalocyanine are dissolved .-i-n 1 15 parts of-.25% oleum and the mi-xture is heated at -:C,. for 12 hours, then for 2 'hours at 'C.'5

The mixture is cooled and @poured into :500 parts Jllf ice and water'mixed-with parts of :salt. I-Ihe precipitated blue product is filtered oil and washed free from acid with 10% aqueous salt-so V -lution.- :It .is-di'ssolved in water and the :solution made, neutral by adding sodium hydroxide solu- :tion. The solution iisevaporated to dryness. 10 parts of the :sulphonated copper phthalocyanine .soebta-inedare heated with 200 partsof nitro'bem zene and 10 parts of phosphorus pentachloride at IOU- C. for 22 hours. The resulting blue solution is filtered from insoluble matter. When cold, petroleum ether "is added to precipitate the sulphonyl chloride, which is filtered .ofi,"was hed with 'petroleumether, and dried. 1

Weclaim:

1. Process for the manufacture of sulphur- I containing dyestuffs comprising heating a member selected .from the group consisting of metalv been converted into a product soluble in sodium sulfide, and recovering the color thus produced.

4. Process for the manufacture of vattable sul-. lphurecontaining dyestuffs of the ;phthalocyanine series, which comprises heating, .atea temperature between 1:10 and C a phthalocyaninewompound selected from'the grouprconsi-s'ting of metaland metal-"free 'pht'ha'locyanines containingsulphonyl chloride groups, with :an organic thicamide which possesses :atlea'sttone fre hydrogen 1 1 atom :on the amide nitrogen and is liquid -atithe uble in hot aqueous, sodiumsulfide.

7. A'process for the manufacture of vattable sulphur-containing dyestufls of the phthalocyan'ineseries, which comprises -heating a copperephthalocyanine-polysulphonyl chloride'with thi'o ureaatz'a'rtemperatureof about 110-'to I75 C.,=arid "re'covering from the melt a product which' is sdl- :uble inhot aqueousso'dium sulfide.

NORMAN HULTON CLIFEORD WOOD.

. ,REFERENGES 0min The following references are off recordin'the file of this patent:

UNITED STATESPATENTS Number Name 7, a ,I'late 2,219,330 Nadler et al. -:0et.-29;194n 

